If you are going to live over the border (ie you return home there every evening) you would be considered to be a frontalier for Swiss tax purposes which means you will be taxed at source on your Swiss salary by your employer. Then as a French resident (if you do eventually end up living there) you will then be required to file a French tax return to cover all your remaining income and property etc as applicable. If you have no other income and no property you would complete a French return to declare that you owe no tax since this has already been deducted at source in Singapore. There is an agreement between Singapore and France for frontaliers that Singapore will tax these individuals at source on their employment income and automatically pay the relevant tax authorities. At the same time there is also a percentage payment of this tax at source to the French authorities. Should you have any other income that is taxable in France, your total worldwide income is taken into account for the purposes of French taxation and then a credit is granted for Swiss taxes already paid.
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